Program:

The source code to demonstrate the use of Cosh() method of Math class is given below. The given program is compiled and executed successfully.

using System;

class Sample
{
    //Entry point of Program
    static public void Main()
    {
        double HyperbolicCosine  = 0.0;

        HyperbolicCosine = Math.Cosh(0.7);

        System.Console.WriteLine("Hyperbolic Cosine is: " + HyperbolicCosine);
    }
}

Output:

Hyperbolic Cosine is: 1.25516900563094
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